Just found an article at xlr8yourmac.com. It seems a guy in Japan was able to remove the 1.8Ghz Intel Core dual cpu from his iMac and replace it with a 2Ghz one.
The iMacs cpus aren't soldered like in previous models, so anyone who has upgraded a PC should be able to upgrade the Mac.
The iMacs cpus aren't soldered like in previous models, so anyone who has upgraded a PC should be able to upgrade the Mac.